公开(公告)号：US10432946B2

公开(公告)日：2019-10-01

申请号：US14964965

申请日：2015-12-10

Applicant: Apple Inc.

Inventor： Yeping Su ,  Chris Y. Chung ,  Hsi-Jung Wu ,  Xiaosong Zhou ,  Jiefu Zhai

IPC: H04N7/12 ,  H04N19/154 ,  H04N19/115 ,  H04N19/137 ,  H04N19/187 ,  H04N19/177 ,  H04N7/01 ,  H04N19/117 ,  H04N19/31 ,  H04N19/587 ,  H04N19/46 ,  H04N19/85

Abstract: Judder artifacts are remedied in video coding system by employing frame rate conversion at an encoder. A source video sequence may be coded as base layer coded video at a first frame rate. An encoder may identify a portion of the coded video sequence that likely will exhibit judder effects when decoded. For those portions that likely will exhibit judder effects, video data representing the portion of the source video may be coded at a higher frame rate than a frame rate of the coded base layer data as enhancement layer data. Moreover, an encoder may generate metadata representing “FRC hints”—techniques that a decoder should employ when performing decoder-side frame rate conversion. An encoding terminal may transmit the base layer coded video and either the enhancement layer coded video or the FRC hints to a decoder. Thus, encoder infrastructure may mitigate against judder artifacts that may arise during decoding.

公开(公告)号：US20190156518A1

公开(公告)日：2019-05-23

申请号：US16198630

申请日：2018-11-21

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Yeping Su ,  David W. Singer ,  Alexandros Tourapis ,  Fabrice A. Robinet ,  Hsi-Jung Wu

IPC: G06T9/00 ,  G06K9/62 ,  G06T5/00 ,  G06T19/20 ,  G06T7/00

Abstract: A system comprises an encoder configured to compress attribute information and/or spatial for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud. A closed-loop color conversion process is used to improve compression while taking into consideration distortion introduced throughout the point cloud compression process.

公开(公告)号：US10136033B2

公开(公告)日：2018-11-20

申请号：US15650750

申请日：2017-07-14

Applicant: Apple Inc.

Inventor： Alexandros Michael Tourapis ,  Yeping Su ,  David William Singer ,  Hsi-Jung Wu

IPC: H04N1/60 ,  H04N9/67 ,  H04N19/186 ,  H04N19/46 ,  H04N19/85

Abstract: Image and video processing techniques are disclosed for processing components of a color space individually by determining limits for each component based on the relationship between each component in a color space. These limits may then be used to clip each component such that the component values are within the determined range for that component. In this manner, more efficient processing of images and/or video may be achieved.

公开(公告)号：US10021411B2

公开(公告)日：2018-07-10

申请号：US14704707

申请日：2015-05-05

Applicant: Apple Inc.

Inventor： Yeping Su ,  Chris Y. Chung ,  Hsi-Jung Wu ,  Jiefu Zhai ,  Ke Zhang ,  Xiaosong Zhou

IPC: H04N7/12 ,  H04N19/503 ,  H04N19/124 ,  H04N19/172 ,  H04N19/147 ,  H04N19/30

CPC classification number: H04N19/503 ,  H04N19/124 ,  H04N19/147 ,  H04N19/172 ,  H04N19/30

Abstract: A scalable coding system codes video as a base layer representation and an enhancement layer representation. A base layer coder may code an LDR representation of a source video. A predictor may predict an HDR representation of the source video from the coded base layer data. A comparator may generate prediction residuals which represent a difference between an HDR representation of the source video and the predicted HDR representation of the source video. A quantizer may quantize the residuals down to an LDR representation. An enhancement layer coder may code the LDR residuals. In other scalable coding systems, the enhancement layer coder may code LDR-converted HDR video directly.

公开(公告)号：US09992499B2

公开(公告)日：2018-06-05

申请号：US14190880

申请日：2014-02-26

Applicant: Apple Inc.

Inventor： Yeping Su ,  Hao Pan ,  James O. Normile ,  Hsi-Jung Wu

IPC: H04N19/152 ,  H04N19/142 ,  H04N19/87 ,  H04N21/234 ,  H04N21/24 ,  H04N21/44 ,  H04N21/2343 ,  H04N21/845

CPC classification number: H04N19/152 ,  H04N19/142 ,  H04N21/23418 ,  H04N21/23424 ,  H04N21/23439 ,  H04N21/2402 ,  H04N21/44004 ,  H04N21/44008 ,  H04N21/8456

Abstract: Systems and methods are presented for minimizing the suddenness and immediacy of changes to the video quality perceived by users due to bandwidth fluctuations and transitions between different bitrate streams. A method may include identifying an upcoming bitrate change in a bitstream and a nearest scene cut boundary from sync frame scene cut tags included in the bitstream. The method may include calculating whether waiting until the identified nearest scene cut boundary before changing the bitrate will cause the buffer to drop below a threshold. When the buffer is calculated to not drop below the threshold, the method may postpone the upcoming bitrate change until the identified nearest scene cut boundary.

公开(公告)号：US20180091812A1

公开(公告)日：2018-03-29

申请号：US15275076

申请日：2016-09-23

Applicant: Apple Inc.

Inventor： Mei Guo ,  Jae Hoon Kim ,  Jun Xin ,  Feng Yi ,  Yeping Su ,  Dazhong Zhang ,  Chris Chung ,  Xiaosong Zhou ,  Hsi-Jung Wu

IPC: H04N19/117 ,  H04N19/86 ,  H04N19/14 ,  H04N19/15 ,  H04N19/61 ,  H04N19/124 ,  H04N19/13 ,  H04N19/159

CPC classification number: H04N19/117 ,  H04N19/124 ,  H04N19/13 ,  H04N19/134 ,  H04N19/136 ,  H04N19/14 ,  H04N19/15 ,  H04N19/159 ,  H04N19/174 ,  H04N19/176 ,  H04N19/182 ,  H04N19/184 ,  H04N19/186 ,  H04N19/61 ,  H04N19/82 ,  H04N19/86

Abstract: Techniques are disclosed for selecting deblocking filter parameters in a video decoding system. According to these techniques, a boundary strength parameter may be determined based, at least in part, on a bit depth of decoded video data. Activity of a pair of decoded pixel blocks may be classified based, at least in part, on the determined boundary strength parameter, and when a level of activity indicates that deblocking filtering is to be applied to the pair of pixel blocks, pixel block content at a boundary between the pair of pixel blocks may be filtered using filtering parameters derived at least in part based on the bit depth of the decoded video data. The filtering parameters may decrease strength with increasing bit depth of the decoded video data, which improves quality of the decoded video data.

公开(公告)号：US09716871B2

公开(公告)日：2017-07-25

申请号：US14603109

申请日：2015-01-22

Applicant: Apple Inc.

Inventor： Jiefu Zhai ,  Yeping Su ,  Hsi-Jung Wu ,  Chris Y. Chung ,  Xiaosong Zhou ,  Ke Zhang

IPC: H04N9/67 ,  H04N9/64 ,  H04N1/64

CPC classification number: H04N9/67 ,  H04N1/646 ,  H04N9/646

Abstract: An encoder may include a luma transform, a transformer, and a chroma transform. The luma transform may determine a linear luminance value based upon a plurality of primary color values of a pixel. The transformer may generate a transformed luminance value based upon the linear luminance value and a plurality of transformed color values based upon corresponding more than one of the primary color values of the pixel. The chroma transform may determine a plurality of chroma values based upon corresponding plurality of transformed color values and the transformed luminance value of the pixel.

公开(公告)号：US20170134731A1

公开(公告)日：2017-05-11

申请号：US15349989

申请日：2016-11-11

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  David W. Singer ,  Hsi-Jung Wu ,  Yeping Su

IPC: H04N19/154 ,  H04N19/124 ,  H04N19/51 ,  H04N19/15 ,  H04N19/105 ,  H04N19/61 ,  H04N19/13

CPC classification number: H04N19/154 ,  H04N1/646 ,  H04N9/646 ,  H04N9/67 ,  H04N19/105 ,  H04N19/124 ,  H04N19/13 ,  H04N19/15 ,  H04N19/17 ,  H04N19/186 ,  H04N19/51 ,  H04N19/61

Abstract: Techniques for selecting a luminance value for color space conversion are disclosed. Techniques include determining values for Cb and Cr from values for R′, G′, and B′; producing a reconstructed Cb* value and a reconstructed Cr* value by processing the Cb and Cr values; and determining a plurality of Y′ value options from the values for Cb* and Cr*. A Y′ output value may be selected based on the plurality of Y′ value options.

公开(公告)号：US09571827B2

公开(公告)日：2017-02-14

申请号：US13631605

申请日：2012-09-28

Applicant: Apple Inc.

Inventor： Yeping Su ,  Hsi-Jung Wu ,  Hao Pan ,  Ke Zhang

IPC: H04N19/10 ,  H04N21/234 ,  H04N21/2343 ,  H04N21/242 ,  H04N21/845 ,  H04N7/12 ,  G06K9/36

CPC classification number: H04N19/10 ,  H04N21/23424 ,  H04N21/23439 ,  H04N21/242 ,  H04N21/8456

Abstract: A video coding server may code a common video sequence into a plurality of coded data streams, each coded data stream representing the video sequence coded using coding parameters tailored for a respective transmission bit rate. The coding may cause a set of transmission units from among the coded data streams to include coded video data from a common point of the video sequence, and a first coded frame of each transmission unit of the set to be a synchronization frame. A manifest file may be built representing an index of transmission units of the respective coded data streams. The coded data streams and manifest file may be stored by the server for delivery to a client device. During download and decode, the chunks may be decoded efficiently even when switching among streams because the first frame in each chunk is a synchronization frame.

Abstract translation: 视频编码服务器可以将公共视频序列编码为多个编码数据流，每个编码数据流表示使用针对相应传输比特率定制的编码参数进行编码的视频序列。 编码可以使得编码数据流中的一组传输单元包括来自视频序列的公共点的编码视频数据和作为同步帧的组的每个传输单元的第一编码帧。 可以构建表示相应编码数据流的传输单元的索引的清单文件。 编码数据流和清单文件可以由服务器存储以传送到客户端设备。 在下载和解码期间，即使在每个块中的第一帧是同步帧时，即使切换流之间也可以有效地解码该块。

公开(公告)号：US20160360234A1

公开(公告)日：2016-12-08

申请号：US15172064

申请日：2016-06-02

Applicant: Apple Inc.

Inventor： Alexandros Michael Tourapis ,  David William Singer ,  Haitao Guo ,  Hsi-Jung Wu ,  Sorin C. Cismas ,  Xiaohua Yang ,  Yeping Su ,  Dazhong Zhang

IPC: H04N19/593 ,  H04N19/182 ,  H04N19/176

CPC classification number: H04N19/593 ,  H04N19/117 ,  H04N19/156 ,  H04N19/174 ,  H04N19/176 ,  H04N19/182

Abstract: Methods are described for encoding and decoding blocks of image data using intra block copying (IBC). A source block for intra block copying is selected from a source region of a current image that is closer to the current block than a threshold, wherein the source region does not include a portion of the current image that is further from the current block than the threshold.

Abstract translation: 描述了使用块内复制（IBC）对图像数据块进行编码和解码的方法。 从当前图像的比当前块更靠近阈值的源区域中选择用于帧内块复制的源块，其中源区域不包括当前图像的比当前块更远的部分， 阈。